public function testSetAttr()
{
// Test mode 'add'
self::$l->setAttr(['class' => 'bold'], 'add');
$this->assertEquals('main emph bold', self::$l->getAttr()['class']);
// Test mode 'replace'
self::$l->setAttr(['class' => 'main emph'], 'replace');
$this->assertEquals('main emph', self::$l->getAttr()['class']);
}